Hello Experts !

I live in Gilbert AZ just east of Phoenix. In looking for some unusual
tropical looking plants, I remembered growing a Castor bean plant many years
ago back in the Midwest. A friend here also has one in his backyard that is
only about a year old from seed, it has a trunk diameter of about 5 inches
and is a good 12+in height. He gave me a handful of the seeds. I planted 2
and within a week they sprouted and are growing vigorously. My question is
this...how poisonous are these plants and in what manner? Do the seeds have
to be consumed to be deadly or can simply getting sap from a pruning on your
skin cause problems?
My other concern is to our two Pekinese dogs(9-14 lbs). Are these plants
dangerous to them( the plants are in the backyard where they go out
supervised).

Thanks
Brandon